Hierarchy of operators
The Priority or Precedence is the order in which the operators are to be performed is called the Hierarchy of operators. The associativity specifies the operator's direction to be evaluated, it may be left to right or right to left.
| Priority | Operator | Description | Associativity |
|---|---|---|---|
| (Highest) | ( ) | Parentheses | left-to-right |
| ++ , -- | Pre-increment/pre-decrement | right-to-left | |
| sizeof | Determine size in bytes | right-to-left | |
| * , / , % | Multiplication, division, modulus | left-to-right | |
| + , - | Addition, subtraction | left-to-right | |
| < , > , <= , >= | Relational less than, less than or equals to, greater than, greater than or equals to | left-to-right | |
| == , != | Relational is equal to/is not equal to | left-to-right | |
| ++ , -- | Post-increment/post-decrement | right-to-left | |
| && | Logical AND | left-to-right | |
| || | Logical OR | left-to-right | |
| ?: | Ternary conditional | right-to-left | |
| (Lowest) | = -= += >= <= | Assignment | right-to-left |
Example 1: Program to explain operator precedence.
#include<stdio.h>
#include<conio.h>
void main()
{
float r;
clrscr();
r = 1.0 + 2.0 * 3.0 / 4.0;
printf("\n%f",r);
r = 1.0 / 2.0 + 3.0;
printf("\n%f",r);
r = (1.0 + 2.0) / 3.0;
printf("\n%f",r);
r = (1.0 + 2.0 / 3.0) + 4.0;
printf("\n%f",r);
getch();
}
2.500000
3.500000
1.000000
5.666667
3.500000
1.000000
5.666667
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